Just a quick note here.  Something I never thought of when planning a trip, especially a trip involving a lot of walking which, as regular readers will note, is my idea of the best kind of trip.  I had planned on blisters and have a blister kit ready.  But, as I age, I've gained an unwelcome complaint:  plantar faciitis.  It's a condition that causes great foot pain especially in the heel area.  I looked it up and asked around querying mostly folks my age (58).  Lots of folks get it and it goes away after about six months to a year.  This can cause great problems when your trip involves lots of walking.  Fortunately, I found a quick solution that mitigates the condition a lot.  And that solution takes up little room in your pack as well as providing a recreational use.  The solution:  a tennis ball.  Roll the ball with your foot while pressing your foot down upon the ball at the end of the day or after prolonged sitting.  Works for fallen arches too (yep, I have that as well courtesy my military career with Uncle Sam).  Ibuprofen (known to hikers as "Vitamin I") combined with the tennis ball therapy works wonders!  Perhaps I should be so bold as to say it's a vacation saver.  Make room in your pack.  You could be glad you did!